iandol on wed 24 oct 01
Dear Paul,
My answer is
"A Seger formula analysis, also known as the Unity Formula,
represents a way of expressing compositions of glazes, listed as
ratios and proportions of individual molecular oxides, separated into
groups which are classed as basic, amphoteric and acidic in nature.
This analysis and abstract mathematical treatment allows for a
comparison or formulation of batch recipes".
I can see nothing wrong with the definition and explanation given by
Frank Hamer in his introductory paragraph on the topic of
"Formula-Unity".
I hope this satisfies your need.
Best regards,
Ivor Lewis, Redhill, South Australia.
-----Original Message-----
From: Paul Lewing
To: iandol
Date: Wednesday, 24 October 2001 10:04
Subject: Re: Molecules and Seger Formulae
>OK, I've read through all the posts on this several times now, and I
think
>I've got most of it. I see some contradicting opinions, but I think
I'm
>beginning to see the differences between the terms. But my original
>question remains unanswered.
>That question is, "A Seger formula analysis of a particular glaze
represents
>a ............ of that glaze". Now- fill in the blank.
>Please keep in mind here that, while I've been seriously studying
glazes for
>many years, the only chemistry I ever had was high school. But my
real
>concern here is teaching this stuff. The workshop I just got back
from
>teaching was fairly typical in that there were people in it that had
never
>even mixed a glaze test or used a triple-beam balance. So when I try
to
>explain Seger formula to them so they get the basic concept, I don't
want to
>have to explain the differences between a mole and a molecular
equivalent
>and a gram molecular equivalent and a molecule. I just want to be
using the
>proper term and not misleading anyone. In fact, I think if they
filled in
>that blank with the word "molecule", it would meet their needs
perfectly
>well, even if it wasn't technically accurate.
>And I must say how much I appreciate the time and care that Ian,
Karl,
>Michael, and Joseph put into answering me.
>Paul Lewing, Seattle
>
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